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# Piperacillin-Tazobactam
## Overview
Piperacillin-tazobactam is a combination antibiotic consisting of an extended-spectrum penicillin (piperacillin) and a beta-lactamase inhibitor (tazobactam). It exhibits broad-spectrum activity against many Gram-positive, Gram-negative, and anaerobic bacteria.
## Primary Indications
* Complicated intra-abdominal infections
* Complicated skin and skin structure infections
* Community-acquired pneumonia
* Nosocomial pneumonia
* Nosocomial infections, including hospital-acquired pneumonia and ventilator-associated pneumonia
* Bacterial meningitis (in specific circumstances based on susceptibility)
* Empirical treatment of febrile neutropenia
## Adult Dosing
Standard adult doses are typically 3.375 grams (piperacillin 3g/tazobactam 0.375g) or 4.5 grams (piperacillin 4g/tazobactam 1g) administered intravenously every 6 or 8 hours. The specific dose and frequency depend on the severity of infection and local antimicrobial susceptibility patterns. Dosing for severe infections or those caused by less susceptible organisms may require higher doses or more frequent administration, potentially up to 4.5 grams every 4 hours, although this is less common.
## Pediatric Dosing
Dosing in pediatric patients is typically based on piperacillin content.
* **Patients 2 months and older:** Doses range from 100 mg/kg/day to 300 mg/kg/day of piperacillin, divided into 3 or 4 equally divided doses. The total daily dose should not exceed the maximum adult dose of 24 grams per day. Tazobactam is given at a ratio of 1:8 (tazobactam:piperacillin). For example, a dose of 100 mg/kg/day piperacillin would include 12.5 mg/kg/day of tazobactam.
## Dose Adjustments
* **Renal Impairment:** Dose reduction and/or interval adjustment is necessary in patients with significant renal impairment (creatinine clearance < 20 mL/min). Consult specific guidelines for exact adjustments, as they vary based on severity of impairment and dosing frequency.
* **Hepatic Impairment:** No dose adjustment is generally required for hepatic impairment.
## Contraindications
* Hypersensitivity to piperacillin, tazobactam, other beta-lactam antibiotics, or any component of the formulation.
* History of severe allergic reaction (e.g., anaphylaxis) to piperacillin, tazobactam, penicillins, or cephalosporins.
## Adverse Effects
Common adverse effects include diarrhea, nausea, vomiting, rash, headache, insomnia, and phlebitis. Serious adverse effects include C. difficile-associated diarrhea, hypersensitivity reactions (including anaphylaxis), seizures (especially with high doses or renal impairment), neutropenia, thrombocytopenia, and elevated liver enzymes.
## Key Drug Interactions
* **Probenecid:** May increase and prolong piperacillin-tazobactam serum concentrations.
* **Neuromuscular Blocking Agents:** Piperacillin may prolong the action of rocuronium and vecuronium.
* **Warfarin:** Piperacillin may decrease warfarin's effect; monitor INR closely.
* **Methotrexate:** Piperacillin may decrease methotrexate clearance; monitor methotrexate levels.
* **Aminoglycosides:** While sometimes used in combination, coadministration requires careful monitoring for potential antagonism and toxicity, particularly in severe infections. Do not premix in the same IV line.
## Monitoring
* Monitor for signs and symptoms of hypersensitivity reactions.
* Monitor for signs and symptoms of C. difficile infection.
* Monitor renal and hepatic function, especially in patients with pre-existing impairment or receiving concomitant nephrotoxic agents.
* Monitor complete blood counts, particularly in prolonged therapy, for hematologic abnormalities.
* Monitor electrolytes, especially potassium, as piperacillin contains sodium.
## Clinical Pearls
* Piperacillin-tazobactam provides broad coverage but should be de-escalated based on culture and sensitivity results when possible.
* Renal dose adjustment is critical to prevent neurotoxicity and other adverse events.
* The extended infusion (e.g., over 4 hours) may optimize therapeutic drug concentrations, especially for difficult-to-treat infections. Local protocols should be consulted for specific infusion strategies.
* Due to its high sodium content, caution is advised in patients on sodium-restricted diets.
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*Disclaimer: This information is intended for clinical pharmacists and healthcare professionals. It is essential to consult the most current prescribing information and institutional protocols for definitive guidance. Drug information is constantly evolving.*
